S-91327A183 3/8"-16 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Vibration-resistant locking with nylon patch maintains secure fastening in dynamic environments from -50° to 250°F
- Superior corrosion resistance through 18-8 stainless steel construction and passivated finish for extended service life
- Precision alignment capability with Class 3A thread fit and standard shoulder for accurate component positioning
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Enhanced grip and torque transmission through knurled head and 1/4" hex drive for secure installation
- Industry-standard compatibility with UNC coarse threading and ASME B18.3 specifications for reliable interchangeability
- Environmental compliance meeting RoHS 3 and REACH regulations for global manufacturing requirements
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw delivers critical engineering solutions where precision alignment and vibration resistance are paramount. The nylon patch locking mechanism prevents loosening under continuous vibration and thermal cycling (-50° to 250°F), making it ideal for automation equipment, rotating machinery assemblies, and precision instruments. Manufactured from 18-8 stainless steel with passivated finish, it withstands corrosive environments while maintaining structural integrity. The knurled socket head provides superior torque transmission during installation, and the precision Class 3A thread fit ensures consistent engagement in high-cycle applications. These features combine to reduce maintenance frequency and improve operational reliability in industrial settings.
Specification Summary & Compliance
This shoulder screw features Class 3A thread fit with UNC coarse threading (3/8"-16) and meets ASME B18.3 manufacturing specifications. The shoulder diameter maintains tight tolerance of -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005" for precise component alignment. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring stringent material restrictions.
